The emergence of superconductivity in certain metals when cooled below a critical temperature is an example of a phase transition.
当温度降至临界温度以下，某些金属会突然失去电阻，出现超导现象，这就是相变的一个例子。
Especially, since the discovery of high critical temperature cooper oxide superconductors in 1986, superconductivity research reached a high level.
特别是1986年发现了高温氧化物超导体以后，在凝聚态物理学界掀起了研究高温超导的热潮。
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